19.63% is the change from 815 to 975
Calculation steps:
[( 975 - 815 ) ÷ 815] x 100 = 19.63%
Formula
Percentage change = [(975 - 815) / 815] x 100
Subtract the new number by the original number
975 - 815 = 160
160 ÷ 815 = 0.19631901840490798
0.19631901840490798 x 100 = 19.63%